Convert acres to hectares

1. How to convert acres to hectares

The conversion is a single multiplication: ha = acre × 0.40468564224. Both units are defined against the same base — the square metre (m²) — so the factor is fixed and the result is exact to the precision shown.

Worked at the two values people ask for most: 1 acre = 0.40468564 ha and 100 acre = 40.468564 ha. Going the other way, acre = ha × 2.47105381467, so 1 ha = 2.4710538 acre — a direction with its own page, hectares to acres.

Results are given to eight significant figures. That is more precision than most jobs need — for a rough figure, treat 1 acre as about 0.40468564 ha and adjust — but rounding early and multiplying afterwards is how a small error becomes a visible one, so the full figure is what the converter carries.

2. Acres to Hectares conversion table

Every row is the same factor applied — nothing in the table is a special case, and any value in between behaves the same way. Type your own figure into the converter above and the Formula tile shows the arithmetic being used, so the result is checkable rather than taken on trust.

3. What the two units are

• Acres (acre). One acre is 4,046.8564 m².
• Hectares (ha). One ha is 10,000 m².

Both are converted through the square metre (m²): the value is multiplied by its own unit's factor to reach the base, then divided by the target unit's factor to leave it. No direct acres to hectares factor has to exist or be kept correct, which is also why the converter can show the same value in all 10 area units at once.

Area units are the square of their length units, so the factors are squared too: a square foot is 0.3048² m². The two agricultural units are worth memorising — a hectare is exactly 10,000 m² and an acre is exactly 4,046.8564224 m², which is 43,560 square feet, so a hectare is about 2.47 acres.

If the pair you actually want is not this one, the full unit converter runs every 10 area units off the same factor table, along with 11 other categories of measurement.